Metal sharpening machine



March 21, 1933.

C. R. SCHUMACHER METAL SHARPENING MACHINE Filed April 30, 1928 2 Sheets-Sheet l [NV NTOR fliZ M BY ATTORNEY March 3 c. R. SCHUMACHER 1,902,

METAL SHARPENING MACHINE Filed April '30, 1928 2 Sheets-Sheet 2 ATTOR N EY VENTO I 45 W Patented Mar. 21, 1933 UNITED STATE CONRAD R. SCHUMACHER, 0F LY BRooK, MENTS, T0 GILLETTE SAFETY RAZOR. CORPORATION on DELAWARE NEW YORK, ssIG oR, BY MESNE nssIGNg COMPANY, or BOSTON, MAssAoi-msnr'rs, A

METAL SI-IARFENING MACHINE Application filed April 30, 1928. Serial No." 273,835.

The object of my invention is to provide means for honing or grinding the edges of metal parts, and particularly the edges of metal strips which may be honed or ground While traveling through the machine.

The invention comprises a rotative member provided with surfaces to sharpen the metal and mounted to move against the metal under the influence of centrifugal force while the memberrotates to cause the sharpening surfaces to engage the metal.

The invention also comprises novel details of improvement that will be more fully hereinafter set forth and the pointed out in the claims. 1

Reference is to be had to the accompanying drawings, in which,

Fig. 1 is a vertical cross section through the machine;

Fig. 2 is a section on line 2, 2, in Fig. 1;

Fig. 3 is a detail of one ofthe sharpening members; r

Fig. 4 is a detail of a driving wheel for a sharpening member; i

Fig. 5 is a cross section illustrating a modification;

Fig. 6 is a side View of a sharpening machine embodying the invention, and

Fig. 7 is a plan view of Fig. 6.

Similar numerals of reference indicate similar parts in the several figures.

The numeral 1 indicates a suitable support or frame shown provided with spaced uprights 2 having bearings at 3 in which a drive shaft 4 is'journaled. The shaft 4 may be rotated by means of a pulley 5 thereon driven by a belt 6 operated by a pulley 6aon main drive shaft 6?) to be rotated by any suitable source of power, or shaft 4 may be operated in any other desired way. At'7 are sharpening members loosely mounted upon shaft 4 to swing or rock laterally relatively to the plane of the axis of the shaft, under the influence of centrifugal force during rotation, to engage the edge portions of the metal 8 to be sharpened. In the example illustrated the shaft is provided with curved surfaces at 9, upon which the members 7 are mountechsaid members having complemental curved surfaces at 10 engaging the surfaces at 9, in the nature of a ball v or universal joint, whereby the members 7 may swing'or rock onshaft 4. The curved surfaces9 are sh'own'formed on projecting portions of sleeves 11 mounted on shaft4 and secured thereto by pins 12. The members 7 are shown provided with peripheral projections or fingers 7a, suitably spaced apart, said fingers being provided with sharpening means at 13 to engage the metal 8. The sharpening means 18"may com prise suitable material, such as stones or the like for honing the metal, or grinding or abrading materialfor grinding the metal. The sharpening means 13 are shown located on the outer faces of theprojections 7a so as to engage the side edges of the metal or strip 8 as indicated in Figs. land 5.

. In order to rotate the members 7 by and with the shaft 4', and permit said members to have swinging or rocking movements in a lateral direction, the shaft 4 is shown provided with a toothed wheel 14 located adacent to and between the members 7, which wheel may be secured to the shaft by a pin 15, and said members are provided withlaterally. adapted to enter'betwee'n the teeth of wheel 14 for rotating the members by engagement of the teeth with the projections. The projections or pins 16 will operate freely .be-. tween the teeth of wheel 14 during swinging or rocking movements of the members 7.

The metal strip or by the sharpeningmeans 13. In the exam ple illustrated a guide bar 17 is shown provided with a longitudinal groove 170/! in guided, to re- 7 which the strip 8 is slidably tain the edge portion of the strip in position to be engaged by the sharpening means 13.

strip 8indesired position to be sharpened.

Screws 2O "operative in the uprights 18 in adjusted position. 1

piece 8 may be supported in any desiredv wayto be engaged against the bar 17 serveto retain" the latter l disposed projections or pins 16 the latter are tilted.

The strip 8 may be supplied in any well known or desired way, such as a flexible strip wound on a reel 21, journaled on frame 1, and said strip may be fed with respect to the rotating members 7 in any well known or desired way. I have illustrated feed rollers 22 bearing against the sides of the strip 8 to feed it, the rollers being carried by shafts 2'3"journaled on frame 1 and driven by gearing 24, 25, 26, 27, operated by drive shaft 6?) in a well known Way.

The fingers 7a of one member are adapted to project through fingers of the other member 7, and portions of the fingers of one member having the sharpening means 13 project beyond the fingers of the other member, so that the sharpening means of the members respectively bear against opposite side edges of strip 8, Figs. 1 and 5. The members 7 are supported on opposite sides of a plane passingthrough the strip 8, and the strip is. retained in'a plane between the supporting meansof the members, and when the strip is between the crossed fingers of said members When the members 7 r are axially rotated by and with shaft-4 centation of members trifugal force will be set up in said members which will tend to cause them to rock to seek a rectangular position respecting the axis of shaft 4, which tendency will be resisted by contact of the sharpening means 13 against the strip 8, hence said force will serve to press said meansagainst the strip with a pressure commensurate with the speed of r0- 7. During rotation of said members the strip 8 will be propelled, as in the direction of the arrow in Fig. 2, the fingers will intermesh as the members rotate in unison, and the contact, of the means 13 with the side edge portions of the v strip will sharpen the latter.

As illustrated in Fig. 2 portions of the means 13 of several fingers of'each member 7 will always be in contact with strip 8, as the members7 rotate equally and together and press simultaneously on opposite sides of thestrip 8 one member will resist side ressure of the othervmember on the strip and thus the members will tend to keep the y sharpened edge of the strip in a straightline the strip.

or without laterally deflecting each having While vtwo members 7,

' sharpening means 13, are illustrated, adapted for simultaneously sharpening opposite side edges of the'strip '13,, it will be understood that a single member 7 may be used when it is desired only to sharpen one side edge of the strip. When two edge portions of a strip are to be sharpened the members 7 may be arranged in spaced relation, as against the upper and lower edges of the strip as illus- Figs. 6 and 7 When a single edge portion of the strip is to be sharpened one of the pair of members 7 .may be omitted.

the spaces between the and i from shaft 6?).

Having now described my invention what Iclaim is:- I I 1. A sharpening machine comprising 'a pair of separate spaced members located side by side at an angle to one another and having sharpening means in opposing relation on side faces of the members, means sup porting said members for common axial rotation and each member for individual angular rocking movement with respect one to another due to centrifugal force insaid members during rotation thereof, means to rotate said members, and means tosupport a piece of metal in position between said members to be sharpened by said sharpening means withthe axis of a member on the side of the metal remote fromthe'side of the metal engaged by the sharpening means of said member. V

2. A sharpening machine comprising a pair of spaced individual members located side by side and having sharpening means in opposing bers, a shaft, means individually rockably supporting said members on acommon axis upon said shaft for lateral angular. movement relatively one'to the other and to the axis of said shaft, means to rotate said mem bers, and means to retain a piece of metal between said members in position to be sharpened by said sharpening means with the axis of a member on the side of the metal remote from the side of the metal engaged by the sharpening means of said member.

3. A sharpening machine comprising a pair of members having spaced peripheral fingers provided with sharpening means, a shaft, means rockably supporting said members upon the shaft to permit said members to have lateral rocking movements relatively to the axis of the shaft, means to rotate said members in unison with fingers of one member between fingers of member, and means to support a piece of metal between members whereby centrifugal force in said members due to their rotation will cause the-sharpening means to bear against said metal during rotation of said'memloers.

4:. A sharpening machine as set forth in claim 3 in which the means rockably supporting the members upon theshaft includes spaced curved surfaces on the shaft and com- 'plemental curved surfaces on the members pair of members having spaced peripheral the other sharpening means of said relation on side faces of said memfingers provided with sharpening means on side faces of said members opposing metal to be sharpened, a shaft, means rockably supporting each of said members individually in spaced axial relation upon'the shaft with fingers of one member projecting through the spaces between fingers of the support a piece of other member, means to metal in a plane between said member sup porting means, the sharpening means on said fingers respectively engaging the said metal on the side of said plane opposite the support ofthe corresponding member on the shaft, and means torotate the members in unison.

6. A sharpening machine comprising a 7 pair of members having spaced peripheral I fingers provided with sharpening means on side faces of said members opposing metal to be sharpened, a shaft, means rockably supporting said members in spaced axial relation upon the shaft with fingers of one 7 member projecting through the spaces between fingers of the other member, means to support a piece of metal in a plane between said member supporting means, the sharpening means on said fingers respectively engaging opposite sides of the said metal, and means to rotate the members in unison including a toothed wheel on the shaft and projections on the members engageable with the teeth of said wheel.

CONRAD R. SCHUMAGHER. 

